Extrusion device and method for modifying medical polymer material

Abstract

The invention relates to the technical field of extruder equipment, in particular to an extrusion device and method for modifying a medical high polymer material, and the extrusion device comprises a main body, a feeding mechanism mounted at the top of the main body, and an extrusion mechanism for extruding the material; the feeding mechanism comprises a feeding barrel fixedly installed on the main body, an inner barrel installed in the feeding barrel, a stirring assembly for stirring raw materials and an adjusting assembly for adjusting the feeding amount. The stirring assembly comprises a motor fixedly mounted at the top of the inner barrel, a stirring shaft coaxially and fixedly connected with a motor shaft, and a stirring blade and a scattering paddle which are sequentially arranged on the stirring shaft from top to bottom; by arranging the feeding mechanism, the discharging amount of two materials can be adjusted in real time according to the raw material ratio; and meanwhile, when the proportion is large, pre-stirring is realized, so that the quality of an extruded product is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of extruder equipment, and in particular to an extrusion device and method for modifying medical polymer materials. Background Art

[0002] Medical polymer materials are a type of biomaterial based on polymer compounds that are specifically designed and processed for use in the medical field. These materials must possess excellent biocompatibility, chemical stability, and specific physical / mechanical properties to meet the long-term safety and functional requirements under the human physiological environment. Common types include polyesters (such as polylactic acid, polyglycolic acid), polysiloxanes (such as medical silicone), polyurethanes, polyethylene glycol, etc., which are widely used in tissue engineering scaffolds, drug controlled release carriers, implantable devices (such as artificial joints, vascular stents), and medical consumables (such as catheters, sutures).

[0003] Modification of medical polymer materials refers to the structural adjustment of the material itself or its surface through physical, chemical, or biotechnological means to optimize its performance or impart new functions. In the field of medical polymer materials, modification aims to overcome the functional limitations of traditional materials.

[0004] Patent application number CN202411094232.8 discloses an extrusion device for processing medical polymer materials, including a main body, a feed port fixedly connected to the top of the main body, a motor fixedly connected to the back of the main body, an output end of the motor passing through the inner wall of the main body and extending to the interior, an extended end of the motor output end fixedly connected to a spiral rod, and a working box bolted to the side of the main body away from the motor. When the connecting shaft of the present invention rotates, it stirs the material accumulated in the inner cylinder, mixing the outside and inside of the material, avoiding a long contact time between the outer surface of the material and the inner wall of the device when the material accumulates in the inner cylinder, reducing the local high temperature caused by the long residence of the material at the mold outlet, thereby reducing the discoloration and yellowing of the material and improving the molding quality after extrusion.

[0005] This patent stirs the material accumulated in the inner cylinder by rotating the connecting shaft, so that the outside and inside of the material are mixed; when processing medical polymer materials, due to the diversity of raw material ratios, the device performs poorly in regulating the feeding ratio and feeding rate; even if the stirring operation is implemented, it is difficult to achieve the ideal uniform mixing effect of raw materials with different ratios in the inner cylinder.

[0006] Therefore, it is necessary to provide a new technical solution to overcome the above-mentioned defects. Summary of the Invention

[0007] The object of the present invention is to provide an extrusion device and method for modifying medical polymer materials that can effectively solve the above-mentioned technical problems.

[0008] In order to achieve the purpose of the present invention, the following technical solutions are adopted:

[0009] An extrusion device for modifying medical polymer materials, comprising: a main body, a feeding mechanism installed on the top of the main body, and an extrusion mechanism for extruding the material;

[0010] The feeding mechanism includes: a feeding cylinder fixedly mounted on the main body, an inner cylinder mounted inside the feeding cylinder, a stirring assembly for stirring the raw materials, and an adjusting assembly for adjusting the feeding amount;

[0011] The stirring assembly includes: a motor fixedly installed on the top of the inner cylinder, a stirring shaft coaxially fixedly connected to the motor shaft, stirring blades and a spreading paddle sequentially arranged on the stirring shaft from top to bottom.

[0012] Furthermore, the adjustment assembly includes: a hinged ring slidably installed on the stirring shaft, a rotating ring rotatably installed on the inner cylinder, a tensioning plate hinged on the rotating ring, the tensioning plate hinged to the hinged ring through a support rod, and an electric push rod that pushes the hinged ring to move along the stirring shaft; a material blocking cloth is fixedly connected between two adjacent tensioning plates.

[0013] Furthermore, an arc-shaped material-moving rod is fixedly mounted on the outer wall of the inner cylinder, and the arc-shaped material-moving rod is in close contact with the upper surface of the clamping plate.

[0014] Furthermore, the feeding mechanism further comprises: a mixing component for premixing materials with large differences in proportions;

[0015] The mixing assembly includes: a rotating frame rotatably installed in the feeding barrel, a material buffering plate rotatably installed on the rotating frame, and a hinged rod hinged to the material buffering plate; the other end of the hinged rod is hinged to the hinge ring.

[0016] Furthermore, a plurality of groups of buffer plates are equidistantly provided around the rotating frame. The buffer plates are divided into a hinged end and a mixing end. The mixing end is provided with a mixing column.

[0017] Furthermore, a partition is provided on the wall of the loading barrel, a nozzle is provided at the bottom of the partition, and the rotating frame is connected to the partition.

[0018] Furthermore, the buffer plate is also provided with air holes.

[0019] According to another aspect of the present invention, the present invention also relates to a method for producing a physicochemically modified flame-retardant halogen-free cable sheath material, comprising:

[0020] Step S1: After the PLA raw material is dried, it is placed into the upper barrel, and then the remaining raw materials are placed in the inner barrel in sequence;

[0021] Step S2: Setting the stroke of the electric push rod to drive the opening and closing plates to expand outwards to ensure the PLA unloading rate. The electric push rod simultaneously drives the hinge ring downwards to drive the slow plate to form a tapered material guide channel to constrain the material to be bundled and unloaded.

[0022] Step S3: Start the stirring shaft motor, and the wavy blades of the spreading paddle centrifugally spread the PEG into the main PLA material flow to form an annular dispersion layer to achieve material feeding and mixing;

[0023] Step S4: heating and extruding the mixed material by an extruder;

[0024] Step S5: Obtain the finished product after extrusion for inspection, adjust the components according to the inspection results, and change the stroke of the electric push rod until it passes the inspection.

[0025] Compared with the prior art, the present invention has the following beneficial effects: by setting a feeding mechanism, the present invention can adjust the feeding amount of the two materials in real time according to the raw material ratio; at the same time, when the ratio is large, pre-mixing is achieved, thereby further improving the quality of the extruded product. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0027] Figure 1 This is a flow chart of a method for producing a physicochemically modified flame-retardant halogen-free cable sheath material according to the present invention;

[0028] Figure 2 This is a schematic structural diagram of an extrusion device for modifying medical polymer materials according to the present invention;

[0029] Figure 3 It is a structural schematic diagram of the feeding mechanism in the present invention;

[0030] Figure 4 A perspective view of the feeding mechanism of the present invention;

[0031] Figure 5 It is a cross-sectional view of the feeding mechanism in the present invention;

[0032] Figure 6 for Figure 5 A partial enlarged view of part A;

[0033] Figure 7 Schematic diagram of the structure of the arc-shaped material-moving rod in the present invention;

[0034] Figure 8 Schematic diagram of the structure of the regulating component in the present invention;

[0035] Figure 9Schematic diagram of the structure of the mixing component in the present invention;

[0036] Figure 10 This is a gas flow diagram of the injection head when the cylinder is not retracted in the present invention;

[0037] Figure 11 The gas flow diagram of the injection head when the cylinder retracts in the present invention;

[0038] Figure 12 It is a structural schematic diagram of the buffer plate in the present invention.

[0039] In the figure: 1. Main body; 2. Feeding mechanism; 3. Extrusion mechanism; 21. Feeding barrel; 22. Inner barrel; 23. Stirring assembly; 24. Adjusting assembly; 231. Motor; 232. Stirring shaft; 233. Stirring blade; 234. Spreading paddle; 241. Articulated ring; 242. Rotating ring; 245. Opening and closing plate; 246. Support rod; 247. Electric push rod; 248. Material blocking cloth; 221. Arc-shaped material sending rod; 2450. Mixing assembly; 2451. Rotating frame; 2452. Material buffer plate; 2453. Articulated rod; 24521. Articulated end; 24522. Mixing end; 24523. Mixing column; 211. Partition; 212. Jet head; 213. Air hole. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments.

[0041] In the description of the present invention, it should be understood that the terms "center", "transverse", "longitudinal", "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention. When a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a centered component. When a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centered component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a centered component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0042] like Figures 1 to 12As shown, the present invention provides an extrusion device for modifying medical polymer materials, comprising: a main body 1, a feeding mechanism 2 installed on the top of the main body 1, and an extrusion mechanism 3 for extruding the material;

[0043] The feeding mechanism 2 includes: a feeding cylinder 21 fixedly mounted on the main body 1, an inner cylinder 22 mounted inside the feeding cylinder 21, a stirring assembly 23 for stirring the raw materials, and an adjusting assembly 24 for adjusting the feeding amount;

[0044] The stirring assembly 23 includes: a motor 231 fixedly mounted on the top of the inner cylinder 22, a stirring shaft 232 coaxially fixedly connected to the motor 231, stirring blades 233 and a spreading paddle 234 arranged on the stirring shaft 232 in order from top to bottom;

[0045] When a raw material needs to be extruded, the staff pours the raw material into the inner cylinder 22, and the motor 231 is started at this time. The motor 231 drives the stirring shaft 232 to rotate, and the stirring blades 233 and the spreading paddles 234 on the stirring shaft 232 rotate synchronously. The stirring blades fluidize the raw material in the cylinder during the rotation process, effectively shearing and dispersing the raw material particles, eliminating the agglomeration of the raw materials, and ensuring the uniform feeding characteristics of the subsequent extrusion process; it should be added here that the spreading paddle 234 is located at the discharge port of the inner cylinder 22. When the spreading paddle 234 rotates, since the spreading paddle 234 is an annular wavy blade (such as Figure 7 As the raw material is conveyed by gravity, the spreading paddle 234 creates a dynamic centrifugal force field during its rotation, applying a tangential centrifugal force vector to the falling material, creating a spiral spreading motion. This mechanical discretization effectively breaks up the raw material's plunger flow, significantly improving the uniformity of raw material distribution in the extruder's feeding section and effectively avoiding bridging blockage caused by directional accumulation, thereby ensuring stable feeding performance in the continuous production system.

[0046] The adjustment assembly 24 includes: a hinged ring 241 slidably mounted on the stirring shaft 232, a rotating ring 242 rotatably mounted on the inner cylinder 22, a tensioning plate 245 hinged on the rotating ring 242, the tensioning plate 245 hinged to the hinged ring 241 through a support rod 246, and an electric push rod 247 that pushes the hinged ring 241 to move along the stirring shaft 232; a material blocking cloth 248 is fixedly connected between the two adjacent tensioning plates 245.

[0047] A mounting seat is firmly fixed on the stirring shaft 232 , and the electric push rod 247 is fixedly mounted on the mounting seat. The telescopic shaft of the electric push rod 247 is rigidly fixedly connected to the hinge ring 241 .

[0048] When two raw materials (hereinafter referred to as material A and material B) need to be accurately discharged in a certain proportion, the staff first puts material A into the feeding cylinder 21 and simultaneously puts material B into the inner cylinder 22. According to the preset ratio requirements of materials A and B, the staff accurately adjusts the retraction stroke of the electric push rod 247 to achieve accurate proportion discharge control during the continuous feeding process.

[0049] When the electric push rod 247 drives the hinged ring 241 to move downward along the axis of the stirring shaft 232, the hinged ring 241 pulls the support rod 246 downward synchronously through mechanical transmission, and the support rod 246 then pulls the opening and closing plates 245 inward in a linked manner. It is important to note that multiple sets of opening and closing plates 245 are installed and rotate uniformly along the circumference of the rotating ring 242. This structural design allows all opening and closing plates 245 to retract inward synchronously when the electric push rod 247 retracts, resulting in a decrease in the opening angle formed between the opening and closing plates 245. During this process, the distance between the opening and closing plates 245 and the inner wall of the loading barrel 21 increases accordingly.

[0050] Material A, introduced into the loading cylinder 21, naturally falls onto the opening and closing plates 245 under the influence of gravity. A material stopper 248 is installed between the opening and closing plates 245 to effectively prevent material A from falling through the gap between the opening and closing plates 245. The material stopper 248 used here is Oxford cloth, item number 2643, produced by Wujiang Fengxiang Weaving Factory. Given the inherent elasticity of Oxford cloth, the material stopper 248 between the two plates 245 remains stretched during contraction, ensuring effective material retention.

[0051] Therefore, material A that falls onto the opening and closing plate 245 will flow toward the opening formed by the opening and closing plate 245 and the inner wall of the loading barrel 21 due to the inclined structure of the opening and closing plate 245, and ultimately fall into the extruder through this opening, achieving stable loading of material A. When the discharge amount of material A needs to be adjusted, the key lies in controlling the distance between the opening and closing plate 245 and the inner wall of the loading barrel 21. Based on this principle, when proportional discharge is required, the staff only needs to precisely control the push distance of the cylinder to flexibly adjust the discharge amount of material A. The specific value of the cylinder push distance can be set by the staff based on actual operating experience and process requirements.

[0052] An arc-shaped material-moving rod 221 is fixedly mounted on the outer wall of the inner cylinder 22, and the arc-shaped material-moving rod 221 is in close contact with the upper surface of the tensioning plate 245;

[0053] The specially designed curved feed lever 221, featuring a helical profile, is mounted on the outer surface of the inner cylinder 22 at an angle of attack of 5° to 8°. At a stirring shaft 232 speed of 80 to 120 rpm, it generates an axial material flow velocity of 0.8 to 1.2 m / s. This device optimizes material flow trajectory through the Coanda effect, creating a vortex flow field under the influence of a centrifugal acceleration field (approximately 12g), effectively preventing the main material from accumulating on the surface of the opening and closing plate 245.

[0054] It should be noted here that the material A is discharged in an annular manner along the inner wall of the upper barrel 21, while the material B is fed by scattering toward the inner wall of the upper barrel 21 as the spreading paddle 234 rotates, so that when the AB materials are fed at the same time, the radial migration of the materials is enhanced by the Coriolis effect; the material B is centrifugally atomized and scattered by the high-speed spreading paddle 234, and forms a countercurrent mixing effect with the annular gap laminar flow of the material A in three-dimensional space; the AB materials complete turbulent mixing in the feed section of the extruder; the AB materials are pre-mixed when entering the extruder body 1, and the extruded products are of higher quality and better effect.

[0055] When the ratio of components A and B is high, the mixing mechanism within the extruder alone cannot ensure uniformity of the material composition, which will lead to uneven properties in the extruded product. Although manual pre-mixing before loading can improve this problem to a certain extent, it will significantly increase production costs.

[0056] The feeding mechanism 2 further includes: a mixing component 2450 for premixing materials with large differences in proportions;

[0057] The mixing assembly 2450 includes: a rotating frame 2451 rotatably mounted in the loading barrel 21, a material buffering plate 2452 rotatably mounted on the rotating frame 2451, and a hinge rod 2453 hinged to the material buffering plate 2452; the other end of the hinge rod 2453 is hinged to the hinge ring 241;

[0058] The rotating frame 2451 is provided with a plurality of groups of buffer plates 2452 at equal intervals around the rotating frame 2451. The buffer plates 2452 are divided into a hinge end 24521 and a mixing end 24522. The mixing end 24522 is provided with a mixing column 24523.

[0059] When the electric push rod 247 pushes the hinge ring 241 to move downward, the opening and closing plate 245 contracts inward. At this time, the gap between the opening and closing plate 245 and the inner wall of the upper barrel 21 is enlarged. At the same time, the hinge ring 241 moves downward, and the hinge rod 2453 pushes the material-slowing end of the material-slowing plate 2452 to move toward the inner wall of the upper barrel 21, so that the material-slowing plate 2452 rotates along the hinge point on the rotating frame 2451, so that the material-slowing end of the material-slowing plate 2452 moves toward the center of the barrel 21 to form a tapered convergent material guide channel; at this time, the AB material moves downward with the upper barrel 21, and after the AB material falls vertically along the upper barrel 21, Under the constraint of the buffer plate 2452, flow focusing is achieved. At this time, the motor 231 rotates, and the motor 231 drives the hinged rod 2453 to rotate, and at the same time drives the rotating frame 2451 to rotate, so that the buffer plate 2452 rotates circumferentially along the upper barrel 21. The AB materials dropped on the buffer plate 2452 are centrifugally moved along the buffer plate 2452 under the rotation of the buffer plate 2452, thereby achieving slow material discharge, preventing radial dispersion movement caused by centrifugal force when the proportion of AB materials discharged is large and the amount of materials discharged is large, and turbulent mixing is achieved through the array-distributed mixing columns 24523 on the surface of the buffer plate 2452;

[0060] Therefore, this mechanism can achieve the effect of slow feeding and re-stirring of large amounts of AB materials; not only that, this mechanism can realize the material gathering just above the feed port of the extruder body for feeding, and the temperature at the feed port of the extruder body will not rise due to long-term operation of the extruder, and the material will not stick to the feed port when it is fed along the side wall of the feed barrel; it fundamentally eliminates the problem of heat-induced adhesion in the traditional side wall diversion method, especially when processing heat-sensitive polymer composite materials, which can significantly improve production continuity and equipment operation reliability.

[0061] During long periods of continuous extruder operation, the temperature at the extruder feed inlet gradually rises due to the combined effects of heat accumulation and heat conduction. This temperature rise can cause the material entering the feed inlet to melt prematurely, before reaching the intended plasticizing zone, due to changes in the thermal environment. Prematurely melted material increases viscosity and deteriorates fluidity, making it difficult to enter subsequent processing steps at a normal flow rate, leading to material accumulation at the feed inlet.

[0062] The wall of the loading barrel 21 is provided with a partition 211 , the bottom of the partition 211 is provided with a nozzle 212 , and the rotating frame 2451 is connected to the partition 211 .

[0063] When the feed port needs to be cooled, the external air pump releases gas into the interlayer 211 through the nozzle 212, and the array nozzle 212 injects working gas into the lower part of the double-layer jacket structure, and the gas forms a vertical upward laminar flow field along the preset flow channel (such as Figure 10(as shown), forced convection heat transfer effectively reduces heat accumulation in the feed inlet area, while gas shear forces prevent material from clinging to the wall at the feed inlet. The heated gas, after heat exchange, undergoes secondary heat transfer with the wall of the feed barrel 21 during its ascent, achieving pre-drying of the material.

[0064] The baffle plate is further provided with air holes 213; when the air nozzle 212 blows air, the air nozzle 212 can prevent the material from adhering to the side wall when flowing down.

[0065] It should be noted here that when the feeding ratio and feeding amount increase, the buffer plate 2452 is turned over by the driving of the hinge ring 241. At this time, the hinge end 24521 of the buffer plate 2452 turns into the partition 211. At this time, the gas ejected from the air nozzle is guided by the buffer plate 2452 and changes from flowing from bottom to top to flowing into the barrel 21 along the slope of the buffer plate 2452 (as shown in FIG. Figure 11 As shown), the gas is in direct contact with the material, thereby achieving gas stirring while mechanically stirring the AB materials, and the hot air blown out by the nozzle 212 acts directly on the material, thereby solving the problem of poor drying effect when the material is increased.

[0066] The extrusion mechanism 3 for extruding the material includes: a driving motor 2 and an auger; the auger is coaxially and fixedly connected to the motor 2. When the material enters the machine body from the upper hopper, the motor 2 drives the auger to feed and push the material, and then the AB material is heated by a heating block fixedly installed on the machine body.

[0067] A method for producing a modified medical polymer material, comprising:

[0068] Components include:

[0069] Polylactic acid (PLA): 100 parts; polyethylene glycol (PEG-4000): 15-20 parts; heparin sodium: 2-3 parts; nanohydroxyapatite (nHA): 10-15 parts; triethyl citrate: 5 parts; dicumyl peroxide (DCP): 0.5 parts; titanium dioxide sol (TiO2): 3-5.

[0070] The following steps are involved:

[0071] Step S1: After the PLA raw material is dried, it is placed into the upper cylinder 21, and then the remaining raw materials are placed in the inner cylinder in sequence; for example: polyethylene glycol (PEG-4000); sodium heparin; nano-hydroxyapatite (nHA); triethyl citrate; dicumyl peroxide (DCP); titanium dioxide sol (TiO2);

[0072] Step S2: Set the stroke of the electric push rod 247 to 50 mm, drive the opening and closing plates 245 to expand outward, and open the gap to 8 mm to ensure that the PLA feeding rate is 10 kg / h. The electric push rod 247 simultaneously drives the hinge ring 241 to move downward, driving the buffer plate 2452 to form a tapered material guide channel (cone angle 30°) to constrain the material to be bundled and fed;

[0073] Step S3: Start the stirring shaft 232 motor 231 (rotating speed 100 rpm), and the wavy blades of the spreading paddle 234 centrifugally spread the material in the inner cylinder into the PLA main material flow, forming an annular dispersion layer to achieve material feeding and mixing;

[0074] Step S4: heating and extruding the mixed material by an extruder;

[0075] Step S5: Obtain the finished product after extrusion for inspection, adjust the components according to the inspection results, and change the stroke of the electric push rod 247 until it passes the inspection.

[0076] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology, and the circuit connection adopts the conventional connection method in the existing technology. It will not be described in detail here. The content not described in detail in this specification belongs to the existing technology known to professional and technical personnel in this field.

[0077] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all such improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. An extrusion device for modifying medical polymer materials, characterized in that: include: A main body, a feeding mechanism installed on the top of the main body, and an extrusion mechanism for extruding the material; The feeding mechanism includes: a feeding cylinder fixedly mounted on the main body, an inner cylinder mounted inside the feeding cylinder, a stirring assembly for stirring the raw materials, and an adjusting assembly for adjusting the feeding amount; The stirring assembly includes: a motor fixedly installed on the top of the inner cylinder, a stirring shaft coaxially fixedly connected to the motor shaft, stirring blades and a spreading paddle sequentially arranged on the stirring shaft from top to bottom.

2. The extrusion device for modifying medical polymer materials according to claim 1, characterized in that: The adjustment assembly includes: a hinged ring slidably mounted on the stirring shaft, a rotating ring rotatably mounted on the inner cylinder, a tensioning plate hinged on the rotating ring, the tensioning plate hinged to the hinged ring through a support rod, and an electric push rod that pushes the hinged ring to move along the stirring shaft; a material blocking cloth is fixedly connected between two adjacent tensioning plates.

3. The extrusion device for modifying medical polymer materials according to claim 2, characterized in that: An arc-shaped material-moving rod is fixedly mounted on the outer wall of the inner cylinder, and the arc-shaped material-moving rod is in close contact with the upper surface of the clamping plate.

4. The extrusion device for modifying medical polymer materials according to claim 3, characterized in that: The feeding mechanism further comprises: a mixing component for premixing materials with large differences in proportions; The mixing assembly includes: a rotating frame rotatably installed in the feeding barrel, a material buffering plate rotatably installed on the rotating frame, and a hinged rod hinged to the material buffering plate; the other end of the hinged rod is hinged to the hinge ring.

5. The extrusion device for modifying medical polymer materials according to claim 4, characterized in that: A plurality of groups of buffer plates are equidistantly arranged around the rotating frame. The buffer plates are divided into a hinged end and a mixing end. A mixing column is arranged on the mixing end.

6. The extrusion device for modifying medical polymer materials according to claim 1, characterized in that: The wall of the loading barrel is provided with a partition, the bottom of the partition is provided with a spray head, and the rotating frame is communicated with the partition.

7. The extrusion device for modifying medical polymer materials according to claim 5, characterized in that: The buffer plate is also provided with air holes.

8. A method for producing a modified medical polymer material, applied to a production device for a modified medical polymer material according to any one of claims 1 to 7, characterized in that: include: Step S1: After the PLA raw material is dried, it is placed into the upper barrel, and then the remaining raw materials are placed in the inner barrel in sequence; Step S2: Setting the stroke of the electric push rod to drive the opening and closing plates to expand outwards to ensure the PLA unloading rate. The electric push rod simultaneously drives the hinge ring downwards to drive the slow plate to form a tapered material guide channel to constrain the material to be bundled and unloaded. Step S3: Start the stirring shaft motor, and the wavy blades of the spreading paddle centrifugally spread the PEG into the main PLA material flow, forming an annular dispersion layer to achieve material feeding and mixing; Step S4: heating and extruding the mixed material by an extruder; Step S5: Obtain the finished product after extrusion for inspection, adjust the components according to the inspection results, and change the stroke of the electric push rod until it passes the inspection.

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